12V lithium ion battery fault and repair method?

　　Author ：Iflowpower – Portable Power Station Supplier

First, the voltage failure 1, 12V lithium battery voltage is high: after standing, the battery voltage is obviously high, and the other monomer is normal. Cause: 1 Collection error; 2LMU balance function difference or failure; 3 low battery capacity, rapid voltage is rapid. Processing method: 1 The monomer voltage display value is low, and the measurement of the actual voltage value of the monomer is compared.

If the actual value is higher than the display value, and the actual value is standard to LMU with the actual value of the actual value. The monomer voltage is calibrated; if the measured value is consistent with the display value, the manual charging balance is charged. 2 Check if the voltage sampling line is broken, false; 3 replace the LMU; 4 to replace the faulty battery pack.

2, pressure difference: dynamic differential pressure / static pressure difference. When charging, the monomer voltage is quickly cut off voltage skip; when discharges, the monomer voltage is rapidly decreased by other strings; when the discharge is stopped, the monomer voltage increases rapidly than other strings. Cause: 1 Connecting the battery copper card fastening nut loose; 2 connecting surface has dirt; 3 battery self-discharge rate is large; 4 electric wire welding connection bronze card welding (resulting in the string of monomer); 5 individual monomers Core leakage.

Treatment method: 1 Tighten the nut; 2 Clear the connection surface foreign body; 3 to charge the single battery to the charge / discharge equilibrium; 4 to change the problem battery pack. 4, voltage hopping: 12V lithium battery monomer voltage jump when operating or charging with electric equipment. Cause: 1 voltage collection line connection point loose; 2Lum fault.

Treatment method: 1 Tighten the connection point; 2 replacement LMU. Second, temperature class failure 1, thermal management fault; 1 heating fault (heater); when the temperature is below a value, when charging, heating does not open. Cause: 1 heating relay or BMU failure; 2 heating sheet or relay power supply circuit is abnormal.

Handling method: 1 repair or replace the fan relay or BMU failure; 2 Check the power supply circuit is abnormal. 2 heat dissipation failure (fan); after the temperature is above a certain value, the fan does not work. Cause: 1 fan relay or BMU failure; 2 fan or relay power supply circuit.

Handling method: 1 repair or replace the fan relay or BMU failure; 2 Check the power supply circuit is abnormal. 2, high temperature: a alarm threshold in a certain temperature point in the battery system, running or charging. Cause: 1 temperature sensor failure; 2LMU fault; 3 electrical connection abnormal local fever; 4 fan is not opened, heat dissipation; 5 close to the motor; 6 over charge.

Processing method: 1 Measurement temperature sensor resistance value compares the display value, if the actual value is low, the same is the same as the other temperature value, then the LMU temperature value is calibrated with the actual value; 2 fastening electrical connection point Clear connection point foreign matter; 3 ensuring the fan open; 4 increase the insulation material to isolate the heat source; 5 suspend operations for heat dissipation; 6 immediately stop charging; 7 Replace LMU. 3, low temperature: a alarm threshold in a certain or a few temperature points in the battery system, running or charging. Cause: 1 temperature sensor fault; 2LMU fault; 3 local heating sheet abnormal.

Processing method: 1 Measurement temperature sensor resistance value compares the display value, if the actual value is higher than the display value, the actual value is calibrated with the actual value of the standard; 2 Check the repair heating sheet; 3 replacement LMU. 4, temperature difference; refer to high and low temperature troubleshooting method. Codification.

Third, charging failure 1, DC charging fault; GB / T27930-2015 charging cannot be started, charged and jumping, the SOC does not reset after charging. Cause: 1 Battery fault (voltage, temperature, insulation and other abnormal) 2BMU fault (charging module or charging CAN abnormality) 3 main negative, charging relay abnormal 4cc1 pair resistance, CC2 pairs of ground voltage abnormal 5PE field abnormal processing method: 1 exclude Battery Fault 2 Repair / Replacement Failure Part 3 Tread Admission Report, Analyze Fault Reason. 2, AC charging failure; failure cause: 1 battery fault (voltage, temperature, insulation, etc.

) 2BMU fault (charging module or charging CAN abnormal) 3 main negative, charging relay abnormally 4cc pair of earth resistance, CP pairs of ground voltages 5PE Abnormal processing method: 1 exclude battery failure 2 repair / replacement failure part 3 cut compption report, analyze the cause of failure. Fourth, insulation fault failure Cause: battery box or plug-in water, electric core leakage, high environment humidity, insulation and false positives, other high pressure parts (controller, compressor, etc.) insulation.

Treatment method: 1 positive pole pair, if there is a voltage or insulated resistance value less than a predetermined value, the negative electrode circuit is leaked; negative electrode pairs, if there is a voltage or insulated resistance value less than a predetermined value, the positive electrode circuit leakage is determined. The leakage point is calculated according to the single voltage value of the leakage voltage at this time, and then processed according to different cases. V.

Communication fault LUM communication fault, BMU communication fault; the whole vehicle is 1 or several LMU information, or the whole car does not have BMS information. Cause: 1LMU / BMU fault; 2LMU / BMU power supply circuit or communication line contact poor contact; 3 signal interference. Treatment method: 1 Replace the LMU / BMU; 2 Check the power supply circuit / communication line; 3 check the shielding line, find the elimination of interference.

Six, SOC abnormal 1, inaccurate; charging capacity ¡Â Nominal capacity = charging SOC If "charging SOC" "Removed SOC" is deviated from the actual display value or according to the corresponding relationship of SOC and OCV estimates actual power and SOC Corresponding, we think SOC is inaccurate. 2, no change; failure cause: 1 communication abnormalities (data missing); 2 current abnormalities (Hall and its input output circuit); 3BMU fault; 4 other battery alarms. Treatment method: 1 Ensure data complete; 2 repair / replace the failure component; 3 eliminate all battery alarms.

3, faster; failure cause: 1 communication cycle abnormal 2 current abnormalities (Hall forward current is large, feedback current is small); 3 monomer voltage is low, faster; 4BMU fault; 5 low temperature. Handling method: 1 Update the BMU program; 2 Repair / replace the failure component; 4, slow down;. Processing method: 1 Update BMU program; 2 Repair / replace the failure part.

5, beating; confirm that the program version number is correct, the current abnormal failure Cause: 1 Hall and its input output circuit; 2 Hall reverse; 3 DC charging If the BMS demand voltage or current is 0, the charger is smaller. Output capability output. Handling method: 1 Update the BMU program.